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[STM32F4] Introduce a function that sets gpio mode w/o changin pull mode 

This function reads the pull mode from HW and can then be used
to avoid over-writing the previously set pull-up / pull-down modes.

This is done following reported issue: #2638
pull/2920/head
Laurent MEUNIER 2016-09-09 15:55:31 +02:00
parent 646cc89a62
commit e516bddc66
1 changed files with 16 additions and 1 deletions
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17
targets/TARGET_STM/TARGET_STM32F4/pinmap.c
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@ -178,5 +178,20 @@ void pin_mode(PinName pin, PinMode mode)
}
gpio->PUPDR &= (uint32_t)(~(GPIO_PUPDR_PUPDR0 << (pin_index * 2)));
gpio->PUPDR |= (uint32_t)(pupd << (pin_index * 2));
}
/* Internal function for setting the gpiomode/function
* without changing Pull mode
*/
void pin_function_gpiomode(PinName pin, uint32_t gpiomode) {
/* Read current pull state from HW to avoid over-write*/
uint32_t port_index = STM_PORT(pin);
uint32_t pin_index = STM_PIN(pin);
GPIO_TypeDef *gpio = (GPIO_TypeDef *) Set_GPIO_Clock(port_index);
uint32_t temp = gpio->PUPDR;
uint32_t pull = (temp >> (pin_index * 2U)) & GPIO_PUPDR_PUPDR0;
/* Then re-use global function for updating the mode part*/
pin_function(pin, STM_PIN_DATA(gpiomode, pull, 0));
}